Remarkable Ohio


Below is a complete listing of all Ohio Historical Markers. To find a detailed marker listing including text, photographs, and locations, click on a county below. Our listing is updated by the markers program as new markers are installed and older markers are reported damaged or missing.

ALERT (2021): Marker damaged. Awaiting installation of replacement marker.

51-25 First Modern Streamflow Measurement in Ohio

Side A: Streams are both a principal economic resource and a natural hazard in Ohio. Accurate and systematic streamflow records are crucial in protecting lives and property and ensuring an adequate water supply. At this site in 1892 and 1893, engineering students from The Ohio State University (OSU) made the first streamflow measurements in Ohio with a current meter – a technology still in use at the beginning of the 21st century. The U.S. Geological Survey (USGS), an agency that cooperated with OSU in stream-data collection until the early 1900s, furnished the current meters.
Side B: Same
Sponsors: U.S. Geological Survey and The Ohio Historical Society
Address: 681-665 King Avenue, 
Location: King Avenue bridge at Olentangy Trail
Latitude: 39.9906594
Longitude: -83.0232705